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American Journal of Geographical Research and Reviews

American Journal of Geographical Research and Reviews, Hot Articles

Remote sensing identification of early planting information of rapeseed in mountainous areas

Research Article of American Journal of Geographical Research and Reviews Remote sensing identification of early planting information of rapeseed in mountainous areas Lulu Dong1*, Xin Zhang1,2, Wen Dong2 1School of Earth Science and Engineering, Hebei University of Engineering, Handan, China. 2State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China. As a major oilseed crop with high ornamental value, Accurate and timely determination of their distribution and area under cultivation is essential to ensure food security and achieve sustainable development goals. The bright yellow flowers are a unique feature of rapeseed compared to other crops. Therefore, the yellow flower index was previously used to detect rapeseed on aerial images or medium-resolution satellites. However, the impact of its unique topographic terrain structure confuses crop planting structure, while the yellow flower signal of rapeseed is weak in the early stage of rapeseed growth. Therefore, it remains challenging to accurately identify early rapeseed in the southwest mountains. In this study, a new mountain rape index (MWRI) is proposed based on Sentinel-2 time series images. First, the NDVI characteristics of vegetation were used to filter out non-vegetated areas. Secondly, the weak rapeseed signal of non-pure image elements was enhanced by combining the time series reflection variation curves of rapeseed in red, green, NIR, and SWIR bands. The MRM method was used to extract the rapeseed cultivation in Chongqing, a typical mountainous rapeseed growing area in China. Three different previously proposed rapeseed indices: normalized difference yellowness index (NDYI), and yellowness index (RYI) were also calculated for comparison, and validation using high-resolution image interpretation samples in Google earth showed that MWRI has higher rapeseed recognition accuracy OA above 0.97, while other rapeseed indices OA between 0.9 and 0.95. The results indicate that MWRI is an effective index to distinguish ...
American Journal of Geographical Research and Reviews, Hot Articles

Study on Adsorption Characteristics of Coal Reservoirs in Yangyi Mine

Research Article of American Journal of Geographical Research and Reviews Study on Adsorption Characteristics of Coal Reservoirs in Yangyi Mine ZHANG Beibei1,2, SHEN Junping3, SHEN Shuxing4, YAN Zhifeng5* 1School of Earth Science and Engineering, HUE, School of Hebei University of Engineering, Handan 0560382, China; 2Key Laboratory of Coal bed methane Resources and accumulation process of China University of Mining and Technology, Xuzhou 221116, China; 3Aksu Industrial Vocational and Technical College, Aksu, 842000, China; 4Aksu No. 17 Middle School, Aksu, 843000; 5School of Mining, Liaoning Technical University, Fuxin 123000 , China. The method for studying the adsorption characteristics of the coal seam has the density method, the mercury-pressing method and the adsorption method. In this experiment, a low temperature nitrogen adsorption method was used to determine the relative data of the coal-like porosity by using the surface area meter TriStarI3020 to determine the arrangement of the nitrogen molecules on the surface of the coal-like samples. Before the beginning of the experiment, the samples of Yang dong coal reservoir were prepared, weighed, the devaporation time was set at 2h, and the temperature was kept at 105℃.The low temperature nitrogen adsorption experiment was carried out by TriStarII3020.The data of adsorption of nitrogen molecules by coal samples at low temperature are obtained by experiments. The gap characteristics of coal samples are studied by analyzing the characteristic folding points and relative relations of the generated linear diagram. Get coal samples under the condition of low temperature changing with pressure adsorption nitrogen molecular data changes, through the analysis of the linear graph of generated features that are characteristic of fold point and relative relationship to study the space characteristics of the coal sample. Through the analysis can determine the area mainly for both ends of the open pores in coal mine, the porosity of the thin ...
American Journal of Geographical Research and Reviews, Hot Articles

Study on the relationship between traffic dominance and land use efficiency in Shanghai

Research Article of American Journal of Geographical Research and Reviews Study on the relationship between traffic dominance and land use efficiency in Shanghai KANG Chenyuan1*, ZHOU wenqiang2 1School of Earth Science and Engineering, Hebei University of Engineering, Handan 056038, China. 2People’s Government of Longtang Town, Minquan County, Henan Province, Minquan 476818, China. Transportation infrastructure promotes the interconnection of production factors between regions and enhances the efficiency of land use, while land use patterns also have an impact on transportation development patterns and mixes. Although the development of different regions within megacities tends to be integrated, different transportation mixes and land inputs still bring differentiated dynamics to the development of the blocks. In order to explore the relationship between regional traffic conditions and land use efficiency, this paper investigates the traffic development conditions and land use efficiency of each district in Shanghai by using the traffic dominance degree model and the three-stage Super-SBM model, and explores the relevant role relationship between them by using the coupled coordination degree model. The results show that: (1) the central city has the highest traffic dominance, and the suburban areas, especially the distant suburban areas, have low traffic dominance; (2) the land use efficiency of the eastern area of Shanghai is significantly higher than that of the western area, and the land use efficiency of the southern area is higher than that of the northern area; (3) in terms of coupling coordination, the traffic development and land use efficiency of most districts are coordinated, but the degree of coordination varies greatly, with Huangpu District, Yangpu District, Pudong New Area, and Hongqiao District. Yangpu District, Pudong New Area and Hongkou District are at a high level of coordinated development, Chongming District and Changning District are at an uncoordinated development, and the rest of the districts are ...
American Journal of Geographical Research and Reviews, Hot Articles

A Preliminary Study on Constructing the Bed Sounding Data from DEM

Research Article of American Journal of Geographical Research and Reviews A Preliminary Study on Constructing the Bed Sounding Data from DEM Wang Yan College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China. Accurate riverbed information, including riverbed shape, sounding data and elevation data, is needed to simulate the process of flooding in flooded areas by using two-dimensional hydrodynamic model. DEM data is an important feature reflecting topographic changes and plays an important role in hydrological model analysis.However, in the plain area where DEM elevation changes are very small, the extraction and simulation of river network are of low accuracy in the process of hydrologic analysis, and there are great errors in watershed division. Taking the Mihe river basin, shouguang city, shandong province as the research object, based on WMS to abnormal proofreading is smoothing the center line of the river, get in line with the physical meaning of vector river network, the inversion to the original elevation data (DEM), and on this basis, with the river elevation information center line interpolation, construct a sounding data of river model, provide technical support for the two-dimensional hydrodynamic model. Keywords: River center line; DEM; Riverbed construction; WMS; Mihe river basin; Abnormal point correction ...

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American Journal of Geographical Research and Reviews

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